SOLUTION: a chemist has 100 mL of 20% ammonia solution. how many milliliters of water must she add to reduce the ammonia concentration to 8%?

SOLUTION: a chemist has 100 mL of 20% ammonia solution. how many milliliters of water must she add to reduce the ammonia concentration to 8%?

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Question 650687: a chemist has 100 mL of 20% ammonia solution. how many milliliters of water must she add to reduce the ammonia concentration to 8%?
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
a chemist has 100 mL of 20% ammonia solution. how many milliliters of water must she add to reduce the ammonia concentration to 8%?
**
let x=amt of water to add
..
20%*100=8%(100+x)
20=8+.08x
.08x=12
x=150
amt of water to add=150 mL
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